He was referring to the select PIN on the controller, not a non-existent button. When you're using a 3 button Genesis controller this pin (7) will be shorted to ground (8) when the third button is pressed. Obviously, this isn't something you want to do - even if you personally haven't fried your C64 - since pin 7 is +5V intended to feed the POT lines.Shot97 wrote:How can you press a button that doesn't even exist on the controller itself? That was a terrible explanation.
When you're using a 6 button controller, it's not so clear since this pin becomes a "select" connected to logic in the controller instead of a direct-short switch. Maybe it's only a danger when the Genesis controller is in 3 button mode. Maybe this logic could misinterpret values it "receives" from the C64 and trigger a direct short; I don't believe I'd be interested in finding out.